2004 Ford F350 No Heat

OBNICK

2004 FORD F-350

Heater problem
2004 Ford F350 V8 Four Wheel Drive Automatic

My truck has a 6L Diesel engine.
Ran truck for 45 mins. Temp gage shows normal, but I have no heat coming into the cab. When I drive the truck I have heat coming into the cab but when I stop it starts to blow cold again.